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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 7
Ann. Geophys., 26, 1793–1803, 2008
https://doi.org/10.5194/angeo-26-1793-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 26, 1793–1803, 2008
https://doi.org/10.5194/angeo-26-1793-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  27 Jun 2008

27 Jun 2008

Low-frequency ionospheric sounding with Narrow Bipolar Event lightning radio emissions: energy-reflectivity spectrum

A. R. Jacobson1, R. Holzworth1, and X.-M. Shao2 A. R. Jacobson et al.
  • 1Earth and Space Sciences, University of Washington, Seattle, WA, USA
  • 2ISR Division, Los Alamos National Laboratory, Los Alamos, NM, USA

Abstract. We analyze data on radio-reflection from the D-region of the lower ionosphere, retrieving the energy-reflection coefficient in the frequency range ~5–95 kHz. The data are the same as developed for a recent study of ionospheric-reflection height, and are based on recordings of powerful (multi-Gigawatt) radio emissions from a type of narrow (~10 μs) lightning discharge known as "Narrow Bipolar Events". The sequential appearance of first the groundwave signal, and then the ionospheric single-hop reflection signal, permits us to construct the energy-reflection ratio. We infer the energy reflection's statistical variation with solar zenith angle, angle-of-incidence, frequency, and propagation azimuth. There is also a marginally-significant response of the energy reflectivity to solar X-ray flux density. Finally, we review the relationship of our results to previous published reports.

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